For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
const posToTime = new Map(); // 位置 → 到达终点的时间（避免重复计算）。搜狗输入法下载对此有专业解读
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（十二）将在办理治安案件过程中获得的个人信息，依法提取、采集的相关信息、样本用于与治安管理、查处犯罪无关的用途，或者出售、提供给其他单位或者个人的；，更多细节参见safew官方下载
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